9998876891 has 2 divisors, whose sum is σ = 9998876892. Its totient is φ = 9998876890.

The previous prime is 9998876887. The next prime is 9998876933. The reversal of 9998876891 is 1986788999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9998876891 - 2² = 9998876887 is a prime.

It is not a weakly prime, because it can be changed into another prime (9998876801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999438445 + 4999438446.

It is an arithmetic number, because the mean of its divisors is an integer number (4999438446).

Almost surely, 2^9998876891 is an apocalyptic number.

9998876891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998876891 is an equidigital number, since it uses as much as digits as its factorization.

9998876891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141087744, while the sum is 74.

The square root of 9998876891 is about 99994.3842973194. The cubic root of 9998876891 is about 2154.3540315125.

The spelling of 9998876891 in words is "nine billion, nine hundred ninety-eight million, eight hundred seventy-six thousand, eight hundred ninety-one".